25

是否有一种简单直接的方法可以使用某个库从 Haskell 播放 WAV 文件,并且可能让我一次播放许多声音?

我知道 OpenAL,但我不是在编写一些高级音频合成程序,我只是想为一些小玩意儿播放一些声音。理想情况下,API 可能类似于:

readWavFile :: FilePath -> IO Wave
playWave :: Wave -> IO ()
playWaveNonBlocking :: Wave -> IO ()

我很接近仅仅启动 mplayer 或其他东西。或者尝试将 wav 直接发送到 /dev/snd/ 或类似的东西。

4

3 回答 3

34

这是使用 SDL 一次在多个通道上播放多个声音的方法。我认为这回答了问题标准。WAV 文件,简单,Haskell,多通道。

import Control.Monad
import Control.Monad.Fix
import Graphics.UI.SDL as SDL
import Graphics.UI.SDL.Mixer as Mix

main = do
  SDL.init [SDL.InitAudio]
  result <- openAudio audioRate audioFormat audioChannels audioBuffers
  classicJungle <- Mix.loadWAV "/home/chris/Samples/ClassicJungle/A4.wav"
  realTech      <- Mix.loadWAV "/home/chris/Samples/RealTech/A4.wav"
  ch1 <- Mix.playChannel anyChannel classicJungle 0
  SDL.delay 1000
  ch2 <- Mix.playChannel anyChannel realTech 0
  fix $ \loop -> do
    SDL.delay 50
    stillPlaying <- numChannelsPlaying
    when (stillPlaying /= 0) loop
  Mix.closeAudio
  SDL.quit

  where audioRate     = 22050
        audioFormat   = Mix.AudioS16LSB
        audioChannels = 2
        audioBuffers  = 4096
        anyChannel    = (-1)
于 2012-12-23T12:47:20.953 回答
10

我意识到这实际上不是一种方便的方法,但我有测试代码,所以......

{-# LANGUAGE NoImplicitPrelude #-}
module Wav (main) where

import Fay.W3C.Events
import Fay.W3C.Html5

import Language.Fay.FFI
import Language.Fay.Prelude

main :: Fay ()
main = addWindowEventListener "load" run

run :: Event -> Fay Bool
run _ = do
    aud <- mkAudio
    setSrc aud "test.wav"
    play aud
    return False


mkAudio :: Fay HTMLAudioElement
mkAudio = ffi "new Audio()"

addWindowEventListener :: String -> (Event -> Fay Bool) -> Fay ()
addWindowEventListener = ffi "window['addEventListener'](%1,%2,false)"

好了——借助 HTML5 的强大功能,在 Haskell 中播放 WAV 文件!您所要做的就是启动一个网络浏览器而不是 mplayer。:D

于 2012-12-22T19:22:28.770 回答
4

通过 ALUT 使用 OpenAL:

import Control.Monad
import Sound.ALUT

playSound :: IO ()
playSound =
  withProgNameAndArgs runALUTUsingCurrentContext $ \_ _ ->
  do
    (Just device) <- openDevice Nothing
    (Just context) <- createContext device []
    currentContext $= Just context
    buffer1 <- createBuffer $ Sine 440 0 1
    buffer2 <- createBuffer HelloWorld
    [source] <- genObjectNames 1
    queueBuffers source [buffer1,buffer2]
    play [source]
    sleep 4
    closeDevice device
    return ()

main = playSound

加载 wav 文件:

buffer3 <- createBuffer $ File "/path/to/file.wav"

归功于 Chris Double:http ://bluishcoder.co.nz/articles/haskell/openal.html

于 2014-11-15T07:52:16.573 回答